• Title/Summary/Keyword: parallel resonant

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A study on the Frequency characteristics of the LLC-type P.R.C and S.R.C (LLC형 병렬 및 직렬 공진 컨버터의 주파수 특성에관한 연구)

  • Choi, J.G.;Cha, I.S.;Park, H.A.;Lee, K.H.
    • Proceedings of the KIEE Conference
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    • 1993.07b
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    • pp.825-829
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    • 1993
  • By using the state plane approach, the steady state analysis and desing of a high frequency LLC-type series resonant converter and LLC-type parallel resonant converter operating in the continuous conduction mode is presented. When a LLC-type P.R.C operates above resonant frequency, the switching transitor can be turn off at zero voltage. A set of characteristic frequency are plotted from which desing parameters can be obtained.

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PRACTICAL EVALUATIONS OF PARASITIC RESONANT PWM DC-DC CONVERTERS FOR HIGH-POWER MEDICAL USE

  • H. Takano;J. Takahashi;Sun, J.M.;L... Gamage;M. Nakaoka
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.701-708
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    • 1998
  • This paper presents a novel non-resonant PWM DC-DC converter for X-ray high-voltage power generator using the parasitic impedances of the high-voltage high-frequency link transformer with its output high-voltage control scheme and steady-state characteristics compared to the conventional series-parallel resonant DC-DC converter. The key point of this approach is to evaluate effectiveness of reduction of the turn ratio of the high-voltage high-frequency transformer on improvements in power conversion efficiency and the power factor applying a boost AC-DC converter as DC voltage source, especially in the long exposure term and light output load ranges.

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Seamless Mode Transfer of Indirect Current Controlled Parallel Grid-Connected Inverters (간접전류제어방식 병렬형 계통연계 인버터의 무순단 모드절환)

  • Song, Injong;Choi, Junsoo;Lim, Kyungbae;Choi, Jaeho
    • The Transactions of the Korean Institute of Power Electronics
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    • v.24 no.5
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    • pp.334-341
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    • 2019
  • This study proposes the control strategy for the seamless mode transfer of indirect current controlled parallel grid-connected inverters. Under the abnormal grid condition, the grid-connected inverter can convert the operation mode from grid-connected to stand-alone mode to supply power to the local load. For a seamless mode transfer, the time delay problems caused by the accumulated control variable error must be solved, and the indirect current control method has been applied as one of the solutions. In this study, the design of control parameters for the proportional-resonant-based triple-loop indirect current controller and the control strategy for the seamless mode transfer of parallel grid-connected inverters are described and analyzed. The validity of the proposed mode transfer method is verified by the PSiM simulation results.

A Study of Power Conversion System for Energy Harvester Using a Piezoelectric Materials (압전소자를 이용한 에너지 하베스터용 전력변환장치 연구)

  • An, Hyunsung;Kim, Young-Cheol;Cha, Hanju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.7
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    • pp.1059-1065
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    • 2017
  • In this paper, the energy harvester with a piezoelectric materials is modeled as the electric equivalent circuit, and performances of a standard DC method and a Parallel-SSHI method are verified through experiment under variable force and load conditions. Piezoelectric generator consists of mass, damper and spring constant, and it is modeled by electrical equivalent circuit with RLC components. Standard DC and Parallel-SSHI are used as power conversion methods, and standard DC consists of full-bridge rectifier and smoothing capacitor. Parallel-SSHI method is composed of L-C resonant circuit, zero-crossing detector and full-bridge rectifier. In case of simulation under $100k{\Omega}$ load condition, the harvested power is $500{\mu}W$ in Standard DC and $670{\mu}W$ in Parallel-SSHI, respectively. In experiment, the harvested power under $100k{\Omega}$ load condition is $420{\mu}W$ in standard DC and $602{\mu}W$ in Parallel-SSHI. Harvested power of Parallel-SSHI is improved by approximately 40% more than that of standard DC method.

A Study on the Characteristics Analysis of LLC AC to DC High Frequency Resonant Converter capable of ZVZCS (ZVZCS가 가능한 LLC AC to DC 고주파 공진 컨버터의 특성 해석에 관한 연구)

  • Kim, Jong-Hae
    • Journal of IKEEE
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    • v.25 no.4
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    • pp.741-749
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    • 2021
  • This paper presents the current-fed type LLC AC to DC high frequency resonant converter capable of ZVZCS(Zero-Voltage and Zero-Current Switching). The current-fed type LLC AC to DC high frequency resonant converter proposed in this paper could operate not only in ZVS(Zero-Voltage Switching) operation by connecting the resonant capacitors(C1, C2) in parallel across the switching devices but also in ZCS(Zero-Current Switching) operation of the secondary diode. The ZVS and ZCS operations can reduce the turn-on loss of the switching devices and the turn-off loss of the secondary diodes, respectively. The circuit analysis of current-fed type LLC AC to DC high frequency resonant converter proposed in this paper is addressed generally by adopting the normalized parameters. The operating characteristics of proposed LLC AC to DC high frequency resonant converter were also evaluated by using the normalized control parameters such as the normalized control frequency(μ), the normalized load resistor(λ) and so on. Based on the characteristic values through the characteristics of evaluation, an example of the design method of proposed LLC AC to DC high frequency resonant converter is suggested, and the validity of the theoretical analysis is confirmed using the experimental results and PSIM simulation.

A Study on Characteristic Analysis of Current Fed High Frequency Resonant Inverter for Wax-Sealing (Wax-Sealing용 전류형 고주파 공진 인버터의 특성해석에 관한 연구)

  • Kim, Dong-Hui;Won, Jae-Seon
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.50 no.11
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    • pp.568-574
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    • 2001
  • This paper describes a current fed high frequency resonant inverter can be used as the power supply for wax-sealing. This circuit configuration is composed of conventional two unit inverter of single ended current find type in parallel. The proposed inverter can realize ZVS operation by using resonant capacitor to ZVS capacitor and has merits not only reduction of switch current distribution but also extension of load range in comparison with the conventional single-ended current fed high frequency resonant inverter. This analysis of proposed circuit uses normalized parameter and characteristic estimation which is needed in each step before design is generally described according to normalized frequency($\mu$), normalized resistance(λ) and parameters. On the basis of characteristic values, a method of the circuit design is presented. Also, the theoretical analysis is proved through experiment and this proposed circuit shows that it can be practically used as the power supply system for wax-sealing and DC-DC converter.

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A Study on Commercial Frequency Source with High Frequency Resonant Type using ZCS (ZCS를 이용한 고주파 공진형 상용주파수 전원에 관한 연구)

  • Kim, Jong-Hae;Kim, Dong-Hui;No, Chae-Gyun;Gu, Tae-Geun;Bae, Sang-Jun;Lee, Bong-Seop
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.48 no.8
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    • pp.448-454
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    • 1999
  • This paper describes a new dc-ac inverter system which for achieving sinusoidal ac waveform makes use of parallel loaded high frequency resonant inverter consisting of full bridge. Each one of the pair of switches in the inverter is driven to synchronous output frequency and the other is driven to PWM signal with resonant frequency proportional to magnitude of sine wave. A forced discontinuous conduction mode is used to realize the quasi-sinusoidal pulse in each switching period. Therefore the inverter generates sinusoidal modulated output voltage including carrier frequency that is resonant frequency. Carrier frequency components of modulated output voltage is filtered by low pass filter. Since current through switches is always zero at its turn-on in the proposed inverter, low stress and low switching loss is achieved. Operating characteristics of the proposed system is analyzed in per unit system using computer simulation. The output voltage of if includes low harmonics and it is almost close to sine wave. Also, the theoretical analysis is proved through the experimental test.

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Investigation of a SP/S Resonant Compensation Network Based IPT System with Optimized Circular Pads for Electric Vehicles

  • Ma, Chenglian;Ge, Shukun;Guo, Ying;Sun, Li;Liu, Chuang
    • Journal of Power Electronics
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    • v.16 no.6
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    • pp.2359-2367
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    • 2016
  • Inductive power transfer (IPT) systems have become increasingly popular in recharging electric vehicle (EV) batteries. This paper presents an investigation of a series parallel/series (SP/S) resonant compensation network based IPT system for EVs with further optimized circular pads (CPs). After the further optimization, the magnetic coupling coefficient and power transfer capacity of the CPs are significantly improved. In this system, based on a series compensation network on the secondary side, the constant output voltage, utilizing a simple yet effective control method (fixed-frequency control), is realized for the receiving terminal at a settled relative position under different load conditions. In addition, with a SP compensation network on the primary side, zero voltage switching (ZVS) of the inverter is universally achieved. Simulations and experiments have been implemented to validate the favorable applicability of the modified optimization of CPs and the proposed SP/S IPT system.

A Novel Soft-Switching PWM DC/DC Converter with DC Rail Series Switch-Parallel Capacitor Edge Resonant Snubber Assisted by High-Frequency Transformer Parasitic Components

  • Fathy, Khairy;Lee, Hyun-Woo;Nakaoka, Mutsuo
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2005.11a
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    • pp.377-382
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    • 2005
  • This paper presents two new circuit topologies of DC bus lineside active edge resonant snubber assisted soft-switching PWM full-bridge DC-DC converter acceptable for either utility AC 200V-rms or AC 400V-rms input voltage source. One topology of proposed DC-DC converters is composed of a typical voltage source-fed full-bridge high frequency PWM inverter using DC busline side series power semiconductor switching devices with the aid of a parallel capacitive lossless snubber. All the active power switches in the full-bridge arms and DC busline can achieve ZCS turn-on and ZVS turn-off commutations and the total turn-off switching power losses of all active switches can be reduced for high-frequency switching action. It is proved that the more the switching frequency of full-bridge soft switching inverter increases, the more soft-switching PWM DC-DC converter with a hish frequency transformer link has remarkable advantages for its efficiency and power density as compared with the conventional hard-switching PWM inverter type DC-DC converter

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Design of 1.5 kV, 36 kJ/s High Voltage Capacitor Charger for Xenon Lamp Driving (제논램프 구동용 1.5 kV, 36 kJ/s 고전압 충전기 설계)

  • Cho, Chan-Gi;Song, Seung-Ho;Park, Su-Mi;Park, Hyeon-Il;Bae, Jung-Soo;Jang, Sung-Roc;Ryoo, Hong-Je
    • Proceedings of the KIPE Conference
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    • 2017.07a
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    • pp.18-19
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    • 2017
  • This paper shows the design of the high voltage capacitor charger which using a modified series parallel resonant converter. The used silicon carbide Metal-Oxide Semiconductor Field Effect Transistor (SiC MOSFET) is proper for the few hundred kHz of high switching frequency to overcome the bulk resonant inductor and snubber capacitors. Furthermore, to increase the amount of the charging current, three phase delta transformer is used as well as the secondary sides are connected in parallel. In this paper, the design procedure of the high voltage capacitor charger is suggested and the output power is verified by the experimental results with the rated resistor load.

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